Update documentation for HTTP response status code

runtime/bin/http.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * HTTP status codes.
  */
 abstract class HttpStatus {
   static const int CONTINUE = 100;
   static const int SWITCHING_PROTOCOLS = 101;
@@ skipping 571 matching lines @@
  */
 abstract class HttpResponse {
   /**
    * Gets and sets the content length of the response. If the size of
    * the response is not known in advance set the content length to
    * -1 - which is also the default if not set.
    */
   int contentLength;
 
   /**
-   * Gets and sets the status code. Any integer value is accepted, but
-   * for the official HTTP status codes use the fields from
-   * [HttpStatus].
+   * Gets and sets the status code. Any integer value is accepted. For
+   * the official HTTP status codes use the fields from
+   * [HttpStatus]. If no status code is explicitly set the default
+   * value [HttpStatus.OK] is used.
    */
   int statusCode;
 
   /**
    * Gets and sets the reason phrase. If no reason phrase is explicitly
    * set a default reason phrase is provided.
    */
   String reasonPhrase;
 
   /**
@@ skipping 336 matching lines @@
 class RedirectLimitExceededException extends RedirectException {
   const RedirectLimitExceededException(List<RedirectInfo> redirects)
       : super("Redirect limit exceeded", redirects);
 }
 
 
 class RedirectLoopException extends RedirectException {
   const RedirectLoopException(List<RedirectInfo> redirects)
       : super("Redirect loop detected", redirects);
 }